/**
 * Copyright 2011 The Apache Software Foundation
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.hadoop.hbase.index.mapreduce;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Deque;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.TreeMap;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicLong;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.FileUtil;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.HColumnDescriptor;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.TableNotFoundException;
import org.apache.hadoop.hbase.client.HBaseAdmin;
import org.apache.hadoop.hbase.client.HConnection;
import org.apache.hadoop.hbase.client.HTable;
import org.apache.hadoop.hbase.client.ServerCallable;
import org.apache.hadoop.hbase.index.util.IndexUtils;
import org.apache.hadoop.hbase.io.HalfStoreFileReader;
import org.apache.hadoop.hbase.io.Reference;
import org.apache.hadoop.hbase.io.Reference.Range;
import org.apache.hadoop.hbase.io.encoding.DataBlockEncoding;
import org.apache.hadoop.hbase.io.hfile.CacheConfig;
import org.apache.hadoop.hbase.io.hfile.Compression.Algorithm;
import org.apache.hadoop.hbase.io.hfile.HFile;
import org.apache.hadoop.hbase.io.hfile.HFileDataBlockEncoder;
import org.apache.hadoop.hbase.io.hfile.HFileDataBlockEncoderImpl;
import org.apache.hadoop.hbase.io.hfile.HFileScanner;
import org.apache.hadoop.hbase.regionserver.Store;
import org.apache.hadoop.hbase.regionserver.StoreFile;
import org.apache.hadoop.hbase.regionserver.StoreFile.BloomType;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.Pair;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;

import com.google.common.collect.HashMultimap;
import com.google.common.collect.Multimap;
import com.google.common.collect.Multimaps;
import com.google.common.util.concurrent.ThreadFactoryBuilder;

/**
 * Tool to load the output of HFileOutputFormat into an existing table.
 * @see #usage()
 */
public class IndexLoadIncrementalHFile extends Configured implements Tool {

  private static Log LOG = LogFactory.getLog(IndexLoadIncrementalHFile.class);
  static AtomicLong regionCount = new AtomicLong(0);
  private HBaseAdmin hbAdmin;
  private Configuration cfg;

  public static String NAME = "completebulkload";

  public IndexLoadIncrementalHFile(Configuration conf) throws Exception {
    super(conf);
    this.cfg = conf;
    this.hbAdmin = new HBaseAdmin(conf);
  }

  private void usage() {
    System.err.println("usage: " + NAME + " /path/to/hfileoutputformat-output " + "tablename");
  }

  /**
   * Represents an HFile waiting to be loaded. An queue is used in this class in order to support
   * the case where a region has split during the process of the load. When this happens, the HFile
   * is split into two physical parts across the new region boundary, and each part is added back
   * into the queue. The import process finishes when the queue is empty.
   */
  static class LoadQueueItem {
    final byte[] family;
    final Path hfilePath;

    public LoadQueueItem(byte[] family, Path hfilePath) {
      this.family = family;
      this.hfilePath = hfilePath;
    }

    public String toString() {
      return "family:" + Bytes.toString(family) + " path:" + hfilePath.toString();
    }
  }

  /**
   * Walk the given directory for all HFiles, and return a Queue containing all such files.
   */
  private void discoverLoadQueue(Deque<LoadQueueItem> ret, Path hfofDir) throws IOException {
    FileSystem fs = hfofDir.getFileSystem(getConf());

    if (!fs.exists(hfofDir)) {
      throw new FileNotFoundException("HFileOutputFormat dir " + hfofDir + " not found");
    }

    FileStatus[] familyDirStatuses = fs.listStatus(hfofDir);
    if (familyDirStatuses == null) {
      throw new FileNotFoundException("No families found in " + hfofDir);
    }

    for (FileStatus stat : familyDirStatuses) {
      if (!stat.isDir()) {
        LOG.warn("Skipping non-directory " + stat.getPath());
        continue;
      }
      Path familyDir = stat.getPath();
      // Skip _logs and .index, etc
      if (familyDir.getName().startsWith("_")
          || familyDir.getName().startsWith(IndexMapReduceUtil.INDEX_DATA_DIR)) continue;
      byte[] family = Bytes.toBytes(familyDir.getName());
      Path[] hfiles = FileUtil.stat2Paths(fs.listStatus(familyDir));
      for (Path hfile : hfiles) {
        if (hfile.getName().startsWith("_")) continue;
        ret.add(new LoadQueueItem(family, hfile));
      }
    }
  }

  /**
   * Perform a bulk load of the given directory into the given pre-existing table. This method is
   * not threadsafe.
   * @param hfofDir the directory that was provided as the output path of a job using
   *          HFileOutputFormat
   * @param table the table to load into
   * @throws TableNotFoundException if table does not yet exist
   */
  public void doBulkLoad(Path hfofDir, final HTable table) throws TableNotFoundException,
      IOException {
    final HConnection conn = table.getConnection();

    if (!conn.isTableAvailable(table.getTableName())) {
      throw new TableNotFoundException("Table " + Bytes.toStringBinary(table.getTableName())
          + "is not currently available.");
    }

    // initialize thread pools
    int nrThreads =
        cfg.getInt("hbase.loadincremental.threads.max", Runtime.getRuntime().availableProcessors());
    ThreadFactoryBuilder builder = new ThreadFactoryBuilder();
    builder.setNameFormat("LoadIncrementalHFiles-%1$d");
    ExecutorService pool =
        new ThreadPoolExecutor(nrThreads, nrThreads, 60, TimeUnit.SECONDS,
            new LinkedBlockingQueue<Runnable>(), builder.build());
    ((ThreadPoolExecutor) pool).allowCoreThreadTimeOut(true);

    // LQI queue does not need to be threadsafe -- all operations on this queue
    // happen in this thread
    Deque<LoadQueueItem> queue = new LinkedList<LoadQueueItem>();
    try {
      discoverLoadQueue(queue, hfofDir);
      int count = 0;

      if (queue.isEmpty()) {
        LOG.warn("Bulk load operation did not find any files to load in " + "directory "
            + hfofDir.toUri() + ".  Does it contain files in "
            + "subdirectories that correspond to column family names?");
        return;
      }

      if (queue.isEmpty()) {
        LOG.warn("Bulk load operation did not find any files to load in " + "directory "
            + hfofDir.toUri() + ".  Does it contain files in "
            + "subdirectories that correspond to column family names?");
      }

      // Assumes that region splits can happen while this occurs.
      while (!queue.isEmpty()) {
        // need to reload split keys each iteration.
        final Pair<byte[][], byte[][]> startEndKeys = table.getStartEndKeys();
        if (count != 0) {
          LOG.info("Split occured while grouping HFiles, retry attempt " + +count + " with "
              + queue.size() + " files remaining to group or split");
        }

        int maxRetries = cfg.getInt("hbase.bulkload.retries.number", 0);
        if (maxRetries != 0 && count >= maxRetries) {
          LOG.error("Retry attempted " + count + " times without completing, bailing out");
          return;
        }
        count++;

        // Using ByteBuffer for byte[] equality semantics
        Multimap<ByteBuffer, LoadQueueItem> regionGroups =
            groupOrSplitPhase(table, pool, queue, startEndKeys);

        bulkLoadPhase(table, conn, pool, queue, regionGroups);

        // NOTE: The next iteration's split / group could happen in parallel to
        // atomic bulkloads assuming that there are splits and no merges, and
        // that we can atomically pull out the groups we want to retry.
      }

    } finally {
      pool.shutdown();
      if (queue != null && !queue.isEmpty()) {
        StringBuilder err = new StringBuilder();
        err.append("-------------------------------------------------\n");
        err.append("Bulk load aborted with some files not yet loaded:\n");
        err.append("-------------------------------------------------\n");
        for (LoadQueueItem q : queue) {
          err.append("  ").append(q.hfilePath).append('\n');
        }
        LOG.error(err);
      }
    }
  }

  /**
   * This takes the LQI's grouped by likely regions and attempts to bulk load them. Any failures are
   * re-queued for another pass with the groupOrSplitPhase.
   */
  protected void bulkLoadPhase(final HTable table, final HConnection conn, ExecutorService pool,
      Deque<LoadQueueItem> queue, final Multimap<ByteBuffer, LoadQueueItem> regionGroups)
      throws IOException {
    // atomically bulk load the groups.
    Set<Future<List<LoadQueueItem>>> loadingFutures = new HashSet<Future<List<LoadQueueItem>>>();
    for (Entry<ByteBuffer, ? extends Collection<LoadQueueItem>> e : regionGroups.asMap().entrySet()) {
      final byte[] first = e.getKey().array();
      final Collection<LoadQueueItem> lqis = e.getValue();

      final Callable<List<LoadQueueItem>> call = new Callable<List<LoadQueueItem>>() {
        public List<LoadQueueItem> call() throws Exception {
          List<LoadQueueItem> toRetry =
              tryAtomicRegionLoad(conn, table.getTableName(), first, lqis);
          return toRetry;
        }
      };
      loadingFutures.add(pool.submit(call));
    }

    // get all the results.
    for (Future<List<LoadQueueItem>> future : loadingFutures) {
      try {
        List<LoadQueueItem> toRetry = future.get();

        // LQIs that are requeued to be regrouped.
        queue.addAll(toRetry);

      } catch (ExecutionException e1) {
        Throwable t = e1.getCause();
        if (t instanceof IOException) {
          // At this point something unrecoverable has happened.
          // TODO Implement bulk load recovery
          throw new IOException("BulkLoad encountered an unrecoverable problem", t);
        }
        LOG.error("Unexpected execution exception during bulk load", e1);
        throw new IllegalStateException(t);
      } catch (InterruptedException e1) {
        LOG.error("Unexpected interrupted exception during bulk load", e1);
        throw new IllegalStateException(e1);
      }
    }
  }

  /**
   * @return A Multimap<startkey, LoadQueueItem> that groups LQI by likely bulk load region targets.
   */
  private Multimap<ByteBuffer, LoadQueueItem>
      groupOrSplitPhase(final HTable table, ExecutorService pool, Deque<LoadQueueItem> queue,
          final Pair<byte[][], byte[][]> startEndKeys) throws IOException {
    // <region start key, LQI> need synchronized only within this scope of this
    // phase because of the puts that happen in futures.
    Multimap<ByteBuffer, LoadQueueItem> rgs = HashMultimap.create();
    final Multimap<ByteBuffer, LoadQueueItem> regionGroups = Multimaps.synchronizedMultimap(rgs);

    // drain LQIs and figure out bulk load groups
    Set<Future<List<LoadQueueItem>>> splittingFutures = new HashSet<Future<List<LoadQueueItem>>>();
    while (!queue.isEmpty()) {
      final LoadQueueItem item = queue.remove();

      final Callable<List<LoadQueueItem>> call = new Callable<List<LoadQueueItem>>() {
        public List<LoadQueueItem> call() throws Exception {
          List<LoadQueueItem> splits = groupOrSplit(regionGroups, item, table, startEndKeys);
          return splits;
        }
      };
      splittingFutures.add(pool.submit(call));
    }
    // get all the results. All grouping and splitting must finish before
    // we can attempt the atomic loads.
    for (Future<List<LoadQueueItem>> lqis : splittingFutures) {
      try {
        List<LoadQueueItem> splits = lqis.get();
        if (splits != null) {
          queue.addAll(splits);
        }
      } catch (ExecutionException e1) {
        Throwable t = e1.getCause();
        if (t instanceof IOException) {
          LOG.error("IOException during splitting", e1);
          throw (IOException) t; // would have been thrown if not parallelized,
        }
        LOG.error("Unexpected execution exception during splitting", e1);
        throw new IllegalStateException(t);
      } catch (InterruptedException e1) {
        LOG.error("Unexpected interrupted exception during splitting", e1);
        throw new IllegalStateException(e1);
      }
    }
    return regionGroups;
  }

  // unique file name for the table
  String getUniqueName(byte[] tableName) {
    String name = Bytes.toStringBinary(tableName) + "," + regionCount.incrementAndGet();
    return name;
  }

  protected List<LoadQueueItem> splitStoreFile(final LoadQueueItem item, final HTable table,
      byte[] startKey, byte[] splitKey) throws IOException {
    final Path hfilePath = item.hfilePath;

    // We use a '_' prefix which is ignored when walking directory trees
    // above.
    final Path tmpDir = new Path(item.hfilePath.getParent(), "_tmp");

    LOG.info("HFile at " + hfilePath + " no longer fits inside a single " + "region. Splitting...");

    String uniqueName = getUniqueName(table.getTableName());
    HColumnDescriptor familyDesc = table.getTableDescriptor().getFamily(item.family);
    Path botOut = new Path(tmpDir, uniqueName + ".bottom");
    Path topOut = new Path(tmpDir, uniqueName + ".top");
    splitStoreFile(getConf(), hfilePath, familyDesc, splitKey, botOut, topOut);

    // Add these back at the *front* of the queue, so there's a lower
    // chance that the region will just split again before we get there.
    List<LoadQueueItem> lqis = new ArrayList<LoadQueueItem>(2);
    lqis.add(new LoadQueueItem(item.family, botOut));
    lqis.add(new LoadQueueItem(item.family, topOut));

    LOG.info("Successfully split into new HFiles " + botOut + " and " + topOut);
    return lqis;
  }

  /**
   * Attempt to assign the given load queue item into its target region group. If the hfile boundary
   * no longer fits into a region, physically splits the hfile such that the new bottom half will
   * fit and returns the list of LQI's corresponding to the resultant hfiles. protected for testing
   */
  protected List<LoadQueueItem> groupOrSplit(Multimap<ByteBuffer, LoadQueueItem> regionGroups,
      final LoadQueueItem item, final HTable table, final Pair<byte[][], byte[][]> startEndKeys)
      throws IOException {
    final Path hfilePath = item.hfilePath;
    final FileSystem fs = hfilePath.getFileSystem(getConf());
    HFile.Reader hfr = HFile.createReader(fs, hfilePath, new CacheConfig(getConf()));
    final byte[] first, last;
    try {
      hfr.loadFileInfo();
      first = hfr.getFirstRowKey();
      last = hfr.getLastRowKey();
    } finally {
      hfr.close();
    }

    LOG.info("Trying to load hfile=" + hfilePath + " first=" + Bytes.toStringBinary(first)
        + " last=" + Bytes.toStringBinary(last));
    if (first == null || last == null) {
      assert first == null && last == null;
      // TODO what if this is due to a bad HFile?
      LOG.info("hfile " + hfilePath + " has no entries, skipping");
      return null;
    }
    if (Bytes.compareTo(first, last) > 0) {
      throw new IllegalArgumentException("Invalid range: " + Bytes.toStringBinary(first) + " > "
          + Bytes.toStringBinary(last));
    }
    int idx = Arrays.binarySearch(startEndKeys.getFirst(), first, Bytes.BYTES_COMPARATOR);
    if (idx < 0) {
      // not on boundary, returns -(insertion index). Calculate region it
      // would be in.
      idx = -(idx + 1) - 1;
    }
    final int indexForCallable = idx;
    boolean lastKeyInRange =
        Bytes.compareTo(last, startEndKeys.getSecond()[idx]) < 0
            || Bytes.equals(startEndKeys.getSecond()[idx], HConstants.EMPTY_BYTE_ARRAY);
    if (!lastKeyInRange) {
      List<LoadQueueItem> lqis =
          splitStoreFile(item, table, startEndKeys.getFirst()[indexForCallable],
            startEndKeys.getSecond()[indexForCallable]);
      return lqis;
    }

    // group regions.
    regionGroups.put(ByteBuffer.wrap(startEndKeys.getFirst()[idx]), item);
    return null;
  }

  /**
   * Attempts to do an atomic load of many hfiles into a region. If it fails, it returns a list of
   * hfiles that need to be retried. If it is successful it will return an empty list. NOTE: To
   * maintain row atomicity guarantees, region server callable should succeed atomically and fails
   * atomically. Protected for testing.
   * @return empty list if success, list of items to retry on recoverable failure
   */
  protected List<LoadQueueItem> tryAtomicRegionLoad(final HConnection conn, byte[] tableName,
      final byte[] first, Collection<LoadQueueItem> lqis) throws IOException {

    final List<Pair<byte[], String>> famPaths = new ArrayList<Pair<byte[], String>>(lqis.size());
    for (LoadQueueItem lqi : lqis) {
      famPaths.add(Pair.newPair(lqi.family, lqi.hfilePath.toString()));
    }

    final ServerCallable<Boolean> svrCallable =
        new ServerCallable<Boolean>(conn, tableName, first) {
          @Override
          public Boolean call() throws Exception {
            if (LOG.isDebugEnabled()) {
              LOG.debug("Going to connect to server " + location + " for row "
                  + Bytes.toStringBinary(row));
            }
            byte[] regionName = location.getRegionInfo().getRegionName();
            return server.bulkLoadHFiles(famPaths, regionName);
          }
        };

    try {
      List<LoadQueueItem> toRetry = new ArrayList<LoadQueueItem>();
      boolean success = svrCallable.withRetries();
      if (!success) {
        LOG.warn("Attempt to bulk load region containing " + Bytes.toStringBinary(first)
            + " into table " + Bytes.toStringBinary(tableName) + " with files " + lqis
            + " failed.  This is recoverable and they will be retried.");
        toRetry.addAll(lqis); // return lqi's to retry
      }
      // success
      return toRetry;
    } catch (IOException e) {
      LOG.error("Encountered unrecoverable error from region server", e);
      throw e;
    }
  }

  /**
   * Split a storefile into a top and bottom half, maintaining the metadata, recreating bloom
   * filters, etc.
   */
  static void splitStoreFile(Configuration conf, Path inFile, HColumnDescriptor familyDesc,
      byte[] splitKey, Path bottomOut, Path topOut) throws IOException {
    // Open reader with no block cache, and not in-memory
    Reference topReference = new Reference(splitKey, Range.top);
    Reference bottomReference = new Reference(splitKey, Range.bottom);

    copyHFileHalf(conf, inFile, topOut, topReference, familyDesc);
    copyHFileHalf(conf, inFile, bottomOut, bottomReference, familyDesc);
  }

  /**
   * Copy half of an HFile into a new HFile.
   */
  private static void copyHFileHalf(Configuration conf, Path inFile, Path outFile,
      Reference reference, HColumnDescriptor familyDescriptor) throws IOException {
    FileSystem fs = inFile.getFileSystem(conf);
    CacheConfig cacheConf = new CacheConfig(conf);
    HalfStoreFileReader halfReader = null;
    StoreFile.Writer halfWriter = null;
    HFileDataBlockEncoder dataBlockEncoder =
        new HFileDataBlockEncoderImpl(familyDescriptor.getDataBlockEncodingOnDisk(),
            familyDescriptor.getDataBlockEncoding());
    try {
      halfReader =
          new HalfStoreFileReader(fs, inFile, cacheConf, reference, DataBlockEncoding.NONE);
      Map<byte[], byte[]> fileInfo = halfReader.loadFileInfo();

      int blocksize = familyDescriptor.getBlocksize();
      Algorithm compression = familyDescriptor.getCompression();
      BloomType bloomFilterType = familyDescriptor.getBloomFilterType();

      halfWriter =
          new StoreFile.WriterBuilder(conf, cacheConf, fs, blocksize).withFilePath(outFile)
              .withCompression(compression).withDataBlockEncoder(dataBlockEncoder)
              .withBloomType(bloomFilterType).withChecksumType(Store.getChecksumType(conf))
              .withBytesPerChecksum(Store.getBytesPerChecksum(conf)).build();
      HFileScanner scanner = halfReader.getScanner(false, false, false);
      scanner.seekTo();
      do {
        KeyValue kv = scanner.getKeyValue();
        halfWriter.append(kv);
      } while (scanner.next());

      for (Map.Entry<byte[], byte[]> entry : fileInfo.entrySet()) {
        if (shouldCopyHFileMetaKey(entry.getKey())) {
          halfWriter.appendFileInfo(entry.getKey(), entry.getValue());
        }
      }
    } finally {
      if (halfWriter != null) halfWriter.close();
      if (halfReader != null) halfReader.close(cacheConf.shouldEvictOnClose());
    }
  }

  private static boolean shouldCopyHFileMetaKey(byte[] key) {
    return !HFile.isReservedFileInfoKey(key);
  }

  private boolean doesTableExist(String tableName) throws Exception {
    return hbAdmin.tableExists(tableName);
  }

  /*
   * Infers region boundaries for a new table. Parameter: bdryMap is a map between keys to an
   * integer belonging to {+1, -1} If a key is a start key of a file, then it maps to +1 If a key is
   * an end key of a file, then it maps to -1 Algo: 1) Poll on the keys in order: a) Keep adding the
   * mapped values to these keys (runningSum) b) Each time runningSum reaches 0, add the start Key
   * from when the runningSum had started to a boundary list. 2) Return the boundary list.
   */
  public static byte[][] inferBoundaries(TreeMap<byte[], Integer> bdryMap) {
    ArrayList<byte[]> keysArray = new ArrayList<byte[]>();
    int runningValue = 0;
    byte[] currStartKey = null;
    boolean firstBoundary = true;

    for (Map.Entry<byte[], Integer> item : bdryMap.entrySet()) {
      if (runningValue == 0) currStartKey = item.getKey();
      runningValue += item.getValue();
      if (runningValue == 0) {
        if (!firstBoundary) keysArray.add(currStartKey);
        firstBoundary = false;
      }
    }

    return keysArray.toArray(new byte[0][0]);
  }

  /*
   * If the table is created for the first time, then "completebulkload" reads the files twice. More
   * modifications necessary if we want to avoid doing it.
   */
  private void createTable(String tableName, String dirPath) throws Exception {
    Path hfofDir = new Path(dirPath);
    FileSystem fs = hfofDir.getFileSystem(getConf());

    if (!fs.exists(hfofDir)) {
      throw new FileNotFoundException("HFileOutputFormat dir " + hfofDir + " not found");
    }

    FileStatus[] familyDirStatuses = fs.listStatus(hfofDir);
    if (familyDirStatuses == null) {
      throw new FileNotFoundException("No families found in " + hfofDir);
    }

    HTableDescriptor htd = new HTableDescriptor(tableName);
    HColumnDescriptor hcd = null;

    // Add column families
    // Build a set of keys
    byte[][] keys = null;
    TreeMap<byte[], Integer> map = new TreeMap<byte[], Integer>(Bytes.BYTES_COMPARATOR);

    for (FileStatus stat : familyDirStatuses) {
      if (!stat.isDir()) {
        LOG.warn("Skipping non-directory " + stat.getPath());
        continue;
      }
      Path familyDir = stat.getPath();
      // Skip _logs & .index etc
      if (familyDir.getName().startsWith("_")) continue;

      if (familyDir.getName().startsWith(IndexMapReduceUtil.INDEX_DATA_DIR)) {
        LOG.warn("Ignoring all the HFile specific to " + tableName + " indexed data.");
        continue;
      }

      byte[] family = Bytes.toBytes(familyDir.getName());

      hcd = new HColumnDescriptor(family);
      htd.addFamily(hcd);

      Path[] hfiles = FileUtil.stat2Paths(fs.listStatus(familyDir));
      for (Path hfile : hfiles) {
        if (hfile.getName().startsWith("_")) continue;
        HFile.Reader reader = HFile.createReader(fs, hfile, new CacheConfig(getConf()));
        final byte[] first, last;
        try {
          if (hcd.getCompressionType() != reader.getCompressionAlgorithm()) {
            hcd.setCompressionType(reader.getCompressionAlgorithm());
            LOG.info("Setting compression " + hcd.getCompressionType().name() + " for family "
                + hcd.toString());
          }
          reader.loadFileInfo();
          first = reader.getFirstRowKey();
          last = reader.getLastRowKey();

          LOG.info("Trying to figure out region boundaries hfile=" + hfile + " first="
              + Bytes.toStringBinary(first) + " last=" + Bytes.toStringBinary(last));

          // To eventually infer start key-end key boundaries
          Integer value = map.containsKey(first) ? (Integer) map.get(first) : 0;
          map.put(first, value + 1);

          value = map.containsKey(last) ? (Integer) map.get(last) : 0;
          map.put(last, value - 1);
        } finally {
          reader.close();
        }
      }
    }

    keys = IndexLoadIncrementalHFile.inferBoundaries(map);
    this.hbAdmin.createTable(htd, keys);

    LOG.info("Table " + tableName + " is available!!");
  }

  @Override
  public int run(String[] args) throws Exception {
    if (args.length != 2) {
      usage();
      return -1;
    }

    String dirPath = args[0];
    String tableName = args[1];

    boolean tableExists = this.doesTableExist(tableName);
    if (!tableExists) this.createTable(tableName, dirPath);

    String indexTableName = IndexUtils.getIndexTableName(tableName);
    boolean indexedTable = this.hbAdmin.isTableAvailable(indexTableName);
    if (indexedTable) {
      // load the index data to the indextable
      Path indxhfDir = new Path(dirPath, IndexMapReduceUtil.INDEX_DATA_DIR);
      HTable idxTable = new HTable(this.cfg, indexTableName);
      doBulkLoad(indxhfDir, idxTable);
    }

    Path hfofDir = new Path(dirPath);
    HTable table = new HTable(this.cfg, tableName);
    doBulkLoad(hfofDir, table);

    return 0;
  }

  public static void main(String[] args) throws Exception {
    int ret = ToolRunner.run(new IndexLoadIncrementalHFile(HBaseConfiguration.create()), args);
    System.exit(ret);
  }
}
